WO2006094485A1 - Die cushion device having a numerically controlled drive and a hydraulic pad - Google Patents
Die cushion device having a numerically controlled drive and a hydraulic pad Download PDFInfo
- Publication number
- WO2006094485A1 WO2006094485A1 PCT/DE2006/000395 DE2006000395W WO2006094485A1 WO 2006094485 A1 WO2006094485 A1 WO 2006094485A1 DE 2006000395 W DE2006000395 W DE 2006000395W WO 2006094485 A1 WO2006094485 A1 WO 2006094485A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- die cushion
- cushion device
- pressure
- hydraulic pad
- hydraulic
- Prior art date
Links
- 230000033001 locomotion Effects 0.000 claims description 11
- 230000005540 biological transmission Effects 0.000 claims description 4
- 239000013013 elastic material Substances 0.000 claims description 4
- 238000005555 metalworking Methods 0.000 claims 1
- 230000001419 dependent effect Effects 0.000 description 10
- 230000035939 shock Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000006378 damage Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007620 mathematical function Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000012549 training Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
- B21D24/02—Die-cushions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/22—Deep-drawing with devices for holding the edge of the blanks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
- B21D24/10—Devices controlling or operating blank holders independently, or in conjunction with dies
Definitions
- the invention relates to a die cushion device for a forming press according to the preamble of claim 1.
- the EP 10 82 185 Bl discloses a deep-drawing press with driven by threaded spindle and spindle nut press ram and die cushion.
- the movement of the die cushion is achieved in this embodiment exclusively by electronic drives, which are connected via spindle nut and threaded spindle with the pressure cheek. All drives are coupled without slip.
- a disadvantage is certainly that the electric drives for the die cushion are coupled together.
- Today's requirements, in particular the automotive industry to a forming press require a variable pressure distribution on the pressure cheek. This is prevented by the coupling of the drives.
- the movement of the die cushion is synchronized via electrical waves on the one hand between the plunger and the die cushion and on the other hand between a plurality of servomotors belonging to the die cushion.
- the required pulling force can be tense by changing the engine torque during the deep drawing process.
- the device required for this purpose and the process steps required for the control are not disclosed. In principle, come to control such devices two different variants in question, a force-dependent and a path-dependent control.
- the cushion force is detected by a pressure transducer for each pad pressure point.
- the force transducers can be, for example, piezoelectric or resistive strain transducers.
- the cushion force can be detected indirectly via the motor current of the servomotors. The determined forces are then compared with stored force setpoint values via an NC control device and the servomotors are correspondingly controlled.
- a controller calculates a so-called electronic position cam, which includes the desired course of the pad position as a function of the plunger position.
- the position cam is stored in the form of a table, a mathematical function or a combination of both in the controller.
- the cushion position is influenced by a position control, which receives its setpoint from the position cam disc read out according to the current ram position. The movement of the ram continuously transfers position setpoints to a position controller.
- the servomotor controlled via a power amplifier and the actively connected pressure plate follow the position cam.
- the invention has for its object to develop starting from the prior art, a die cushion device with NC-controlled electric drives, which allows a path-dependent control of the pulling force.
- a die cushion device with NC-controlled electric drives which allows a path-dependent control of the pulling force.
- the possibility of overload protection of the die cushion device is to be created. In particular, this should be realized with the least possible construction costs.
- the invention is based on the core idea, in the motion transmission chain, motor, threaded spindle, spindle nut and pressure cheek, a hydraulic pad which is able to absorb and compensate for impacts and control inaccuracies.
- this hydraulic pad is located between the spindle nut and the pressure cheek and consists of a cylindrical cavity, which is designed as a piston ring surface.
- a fluid which communicates via a hydraulic line with a pressure accumulator in communication and is pressurized.
- This pressure can be changed via a suitable pressure setting.
- the die cushion is pre-accelerated before placing the upper tool on the blank holder so that the relative speed between the upper tool and blank holder is minimized.
- This acts as a shock pulse to the die cushion device, including all drive elements, resulting in a reduction in the life of the corresponding components. But if, as in the die cushion device according to the invention, a hydraulic cushion between the pressure cheek and spindle nut present, this can compensate for these shocks.
- the die cushion device according to the invention causes an improvement in the life of all drive components.
- the hydraulic cushion according to the invention in the motion transmission chain described above at a different location is, for example, between the drive bearing and a support which is firmly connected to the press table.
- the die-cushion device according to the invention can also with a Overload protection can be provided.
- the hydraulic pad is connected to a pressure relief valve.
- This pressure relief valve allows a quick spraying of the hydraulic poster at a specifiable and adjustable pressure. This set value is such that both a normal die cushion operation is possible, and the components of the die cushion device are protected from damage or destruction by overload.
- the size of the oil pads must be sized so that the press has enough time to come to a standstill.
- the hydraulic pad can also be replaced by a pneumatic cushion or an element made of permanently elastic material. If an element made of permanently elastic material is used, it is possible to influence or adjust the elasticity by pretensioning.
- the pressure in the hydraulic cushion not only preset as described above, but also controlled or regulated.
- the path-dependent control of the servomotors can thereby be superimposed with a pressure or force-dependent control via the hydraulic cushion.
- Figure 1 is a schematic representation of the forming press with die cushion
- Figure 2 is a schematic representation of the die cushion device
- Figure 3 is a detail view of the threaded spindle with spindle nut and hydraulic pad
- Figure 1 shows a schematic representation of a forming press 19. Showing the ram 20, the upper and lower tools 21, 22 and the blank holder 23. The blank holder 23 is via pressure pins 24 operatively connected to the die cushion. 1 shows an enlarged view of the die cushion 1 FIG. 2.
- Figure 2 shows a schematic representation of the table area of a forming press with the die cushion device according to the invention 1. You can see parts of the stand 2, the tie rods 3 and the table 4.
- the die cushion device 1 is in the lower area on the drive bearing 5 and the support 6 firmly connected to the table 4.
- the drive bearing 5 serves to receive the servomotor 7 with the threaded spindle 8 attached thereto.
- the threaded spindle 8 is in operative connection with the spindle nut 9, which in turn is connected via a receptacle 10 to the pressure cheek 11.
- the spindle nut 9 By turning the threaded spindle 8 by means of the stationary servo motor 7 thus the spindle nut 9, the receptacle 10 and ultimately the pressure cheek 11 is moved vertically. During this movement, the pressure cheek 11 is guided by means of the guide 12 in the table 4. Immediately before the drawing process, before the Upper tool touches on the sheet holder, not shown here, the pressure cheek 11, which is in operative connection with the sheet holder, partly inquiret in the direction of arrow 13. In general, the blank holder is pre-accelerated by the die cushion so that when placing the
- the relative speed to the blank holder is about 10 - 15% of the absolute speed of the upper tool. This relative speed results in touchdown on a shock pulse, which is transmitted via the pressure cheek 11 on the receptacle 10.
- this shock pulse is not forwarded as in known solutions of the receptacle 10 directly to the spindle nut 9 and thus also on the threaded spindle 8, but on a hydraulic pad 14.
- FIG. 3 the arrangement of the hydraulic pad 14 is shown in more detail.
- the spindle nut 9 is fixedly connected to an intermediate piece 15.
- the intermediate piece 15 fulfills the object of a rotation for the spindle nut 9.
- Between the receptacle 10 and the intermediate piece 15 is a cavity, which is filled in this embodiment with a fluid. This fluid-filled cavity, the hydraulic cushion according to the invention is over a
- Hydraulic line 16 is connected to a pressure accumulator 17.
- the prevailing pressure can be preselected or changed by means of a pressure adjustment fitting 18.
- the invention is not limited to the illustrated and described embodiment. It also includes all expert training in the context of the inventive concept.
- the accumulator 17 and the Druckeinstellarmatur 18 are replaced by a pressure control loop.
- Another variant would be the hydraulic pad 14 equipped with a pressure relief valve so as to realize an overload protection.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Presses And Accessory Devices Thereof (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008500042A JP5129731B2 (en) | 2005-03-07 | 2006-03-06 | Die cushion equipped with NC drive and hydraulic pad |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005010824 | 2005-03-07 | ||
DE102005010824.5 | 2005-03-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006094485A1 true WO2006094485A1 (en) | 2006-09-14 |
Family
ID=36579381
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2006/000395 WO2006094485A1 (en) | 2005-03-07 | 2006-03-06 | Die cushion device having a numerically controlled drive and a hydraulic pad |
Country Status (3)
Country | Link |
---|---|
JP (1) | JP5129731B2 (en) |
ES (1) | ES2331277B2 (en) |
WO (1) | WO2006094485A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1862236A1 (en) * | 2006-05-31 | 2007-12-05 | Schuler Pressen GmbH & Co. KG | Drawing device with hydrostatic spindle bearing |
WO2008064669A2 (en) * | 2006-11-30 | 2008-06-05 | Müller Weingarten AG | Die cushion device comprising a modular hybrid drive unit |
JP2009279620A (en) * | 2008-05-22 | 2009-12-03 | Komatsu Ltd | Die cushion apparatus |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140102630A1 (en) * | 2010-09-28 | 2014-04-17 | Tsung-Han Tsai | Multi-surface appliqueing method for melamine container |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0417752A2 (en) * | 1989-09-12 | 1991-03-20 | Maschinenfabrik Müller-Weingarten AG | Mechanical or hydraulic press with drawing or pressing station for multiple stage press |
DE4100716A1 (en) * | 1991-01-14 | 1992-07-16 | Erfurt Umformtechnik Gmbh | Sheet metal hold-down device in single-acting press - has mechanical device to couple power transmission element |
EP0635320A1 (en) * | 1993-07-24 | 1995-01-25 | Umformtechnik ERFURT GmbH | Pressure pad for single-acting presses in particular for mechanical and transfer presses |
EP1082185B1 (en) * | 1998-05-12 | 2002-03-27 | Johannes Hülshorst | A deep drawing press with a ram hammer and drawing cushion driven by threaded spindles and spindle nuts |
DE102005026100A1 (en) * | 2004-06-01 | 2006-03-09 | Komatsu Ltd. | Die cushion device |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59120022U (en) * | 1983-01-28 | 1984-08-13 | 株式会社小松製作所 | Press dictation device |
JPS61115627A (en) * | 1984-11-10 | 1986-06-03 | Aida Eng Ltd | Die cushion |
JPH0666900U (en) * | 1993-02-10 | 1994-09-20 | 株式会社南雲製作所 | Press machine |
JP2006055872A (en) * | 2004-08-18 | 2006-03-02 | Komatsu Ltd | Die cushion mechanism |
-
2006
- 2006-03-06 WO PCT/DE2006/000395 patent/WO2006094485A1/en active IP Right Grant
- 2006-03-06 ES ES200750052A patent/ES2331277B2/en not_active Expired - Fee Related
- 2006-03-06 JP JP2008500042A patent/JP5129731B2/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0417752A2 (en) * | 1989-09-12 | 1991-03-20 | Maschinenfabrik Müller-Weingarten AG | Mechanical or hydraulic press with drawing or pressing station for multiple stage press |
DE4100716A1 (en) * | 1991-01-14 | 1992-07-16 | Erfurt Umformtechnik Gmbh | Sheet metal hold-down device in single-acting press - has mechanical device to couple power transmission element |
EP0635320A1 (en) * | 1993-07-24 | 1995-01-25 | Umformtechnik ERFURT GmbH | Pressure pad for single-acting presses in particular for mechanical and transfer presses |
EP1082185B1 (en) * | 1998-05-12 | 2002-03-27 | Johannes Hülshorst | A deep drawing press with a ram hammer and drawing cushion driven by threaded spindles and spindle nuts |
DE102005026100A1 (en) * | 2004-06-01 | 2006-03-09 | Komatsu Ltd. | Die cushion device |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1862236A1 (en) * | 2006-05-31 | 2007-12-05 | Schuler Pressen GmbH & Co. KG | Drawing device with hydrostatic spindle bearing |
WO2008064669A2 (en) * | 2006-11-30 | 2008-06-05 | Müller Weingarten AG | Die cushion device comprising a modular hybrid drive unit |
WO2008064669A3 (en) * | 2006-11-30 | 2008-08-14 | Mueller Weingarten Maschf | Die cushion device comprising a modular hybrid drive unit |
JP2009279620A (en) * | 2008-05-22 | 2009-12-03 | Komatsu Ltd | Die cushion apparatus |
Also Published As
Publication number | Publication date |
---|---|
ES2331277A1 (en) | 2009-12-28 |
JP2008531294A (en) | 2008-08-14 |
JP5129731B2 (en) | 2013-01-30 |
ES2331277B2 (en) | 2010-09-24 |
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